We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-05 · 7 min read · Independent comparison
If you want a tiny sleep earbud that doubles as a genuinely usable workout headset, choose YLYHHFY 5.4; if you need the flattest possible profile for side sleeping and small ears, choose Fabater Sleep Earbuds. Both are minuscule in-ear designs built to disappear in your ear, but they solve slightly different problems — one leans toward all-day versatility including training, the other leans hard into pure sleep comfort.
• YLYHHFY 5.4 — biggest strength: A genuinely tiny, featherweight bud (about 3 grams each) with 13mm dynamic drivers, touch controls, and an LED battery readout on the case — it's built to work as a sleep earbud and a general-purpose headset for workout sessions and calls.
• YLYHHFY 5.4 — biggest trade-off: Single-charge playtime is short at roughly 3–4 hours, and the specs list Bluetooth 5.3 rather than the newer 6.0 on the Fabater.
• Fabater Sleep Earbuds — biggest strength: An ultra-flat shell designed specifically for side sleepers, plus two pairs of earbuds in the box and Bluetooth 6.0 for the connection.
• Fabater Sleep Earbuds — biggest trade-off: It's positioned almost entirely around rest — the spec sheet says nothing about playback time, water resistance, or workout durability, so I'd treat it as a sleep-first device.
• Who each pick is for: YLYHHFY 5.4 → people who want one tiny pair to cover sleep, running, gym time, and calls. Fabater → side sleepers and small-eared users who want maximum flatness and don't need a training companion.
The YLYHHFY 5.4 is the more versatile of the two. Its whole pitch is "small enough to forget, capable enough to actually use." Each bud weighs roughly 3 grams, the eartips are soft silicone, and the design is deliberately flat so side sleepers don't get pressure buildup against a pillow. That's the sleep half of the story — and it's a credible one, because a 3-gram bud that sits flush is about as unobtrusive as in-ear audio gets.
The other half is where it separates itself. The 13mm dynamic drivers cover a 20Hz–20,000Hz range, and the spec sheet describes deep bass and a strong mid-range — the kind of tuning that holds up when you're moving rather than lying still. There's a built-in mic on each bud with call noise cancellation, touch controls on the housing, and auto-pairing that reconnects to the last device as soon as you pull them from the case. If you've been hunting for the best in ear headphones for workout use and you also want them to vanish at night, this is the profile that fits: small, light, secure, and tuned for movement.
One more note worth flagging: the marketing copy says Bluetooth 5.4 while the product details list Bluetooth 5.3. Either way you're getting a modern low-latency, low-energy connection — just don't expect the spec sheet to be perfectly consistent. The 18-month warranty is the standout support detail here.
Fabater Sleep Earbuds: Who It's For
The Fabater Sleep Earbuds are built around a single, very specific idea: flatness. The shell is described as ultra-flat, engineered so that when you roll onto your side, the bud presses against the pillow without digging into your ear. If you've ever woken up with a sore ear because a normal earbud pushed back at you all night, that's exactly the problem this design is trying to erase. The buds weigh just 0.1 ounces each and are shaped to follow the ear contour without sealing the canal — so you get sound without the plugged-up feeling.
Connectivity comes from Bluetooth 6.0 with roughly a 10-meter (about 32 feet) transmission range, which is plenty for a bedroom or a walk around the house. The tuning is aimed at relaxation: white noise, audiobooks, meditation tracks, calming music. Soft ear tips reduce ambient noise rather than cancel it electronically, which is a fair description of what passive tips actually do. Charging runs through USB-C, and the case carries a 400mAh battery with four 25mAh buds inside.
The most practical detail is the two-pairs-included approach. You get four earpieces total, two extra ear tips, a charging case, a USB-C cable, and a manual. Fabater explicitly suggests using one pair at a time to avoid streaming hiccups, which tells you the intended workflow: keep one pair charging, wear the other. For a device that lives on your nightstand, that's a smart setup.
Who should buy it: confirmed side sleepers, people with small ear canals who find standard buds too bulky, and anyone who wants a dedicated sleep-and-wind-down pair rather than a do-everything headset. Who should skip it: anyone who wants these for training. The spec sheet makes no claims about sweat resistance, secure-fit stability during motion, or extended playback time — and the connectivity field even reads "ethernet," which is almost certainly a listing error rather than a real wired option. Treat the Fabater as a sleep tool, not a gym tool. Warranty coverage is listed at 90 days, which is shorter than the YLYHHFY's.
• Best for sleep-focused side sleeping → Fabater Sleep Earbuds. The ultra-flat shell is the entire design brief, and it's the flatter of the two by intent.
• Best for a workout headset → YLYHHFY 5.4. 13mm drivers, touch controls, per-bud mics, and a lightweight secure fit make it the more plausible training companion.
• Best for battery flexibility → Fabater Sleep Earbuds. Two pairs of buds plus a 400mAh case mean you can rotate instead of waiting on a charge.
• Best for connection spec → Fabater Sleep Earbuds. Bluetooth 6.0 versus Bluetooth 5.3 on paper.
• Best for calls → YLYHHFY 5.4. It's the only one of the two that advertises call noise cancellation and a mic in each earbud.
• Best for small ears → Fabater Sleep Earbuds. It's explicitly marketed for small ears, with extra tips and two bud sizes to work with.
• Best for audio hardware detail → YLYHHFY 5.4. A named 13mm dynamic driver and a 20Hz–20,000Hz range give you more to reason about than the Fabater's general "clear immersive sound" language.
• Best for warranty peace of mind → YLYHHFY 5.4. 18 months versus 90 days as listed.
In my opinion, the YLYHHFY 5.4 is the better buy for most people, and it's the one I'd pick. The reason is range: it's a tiny sleep bud first, but it also works as a headset for workout sessions, runs, and calls — with real driver specs, touch controls, and dual mics backing that up. The Fabater is excellent at one job, side-sleep flatness, and if that's your only need, it's a smart pick with the bonus of two bud pairs. But if you want a single tiny pair to cover both your pillow and your training, the YLYHHFY 5.4 does more with the same disappearing act. Check the current price on Amazon before deciding, since that's the one variable I can't compare for you.
It's positioned for both. The specs list running and workouts alongside sleeping, and the 13mm drivers, touch controls, and lightweight 3-gram fit support that. It has no stated water-resistance rating, so I'd keep it out of heavy sweat or rain exposure.
The Fabater Sleep Earbuds are designed around side sleeping specifically — the ultra-flat shell is the core feature. The YLYHHFY 5.4 is also flat and light enough for side sleepers, but flatness is the Fabater's entire reason for existing.
Neither sheet describes active noise cancellation. The YLYHHFY 5.4 mentions call noise cancellation for mic clarity, and the Fabater relies on soft tips to reduce ambient sound passively. Both are about blocking sound, not electronically erasing it.
The YLYHHFY 5.4 is the realistic answer here — it has dual mics, touch controls, and a driver spec aimed at bass and mid-range, which suits training audio. The Fabater's spec sheet is built around sleep, meditation, and quiet listening, so I wouldn't count on it as a workout headset.
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