We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-29 · 7 min read · Independent comparison
If you want the lightest possible in-ear feel with a visible battery readout and a longer warranty, choose YLYHHFY 5.4; if you need the flattest, most hidden housing and the longest total playtime, choose Yeforu Flat Sleeping Earbuds.
• YLYHHFY 5.4 — biggest strength: roughly 3 g per earbud with 13 mm dynamic drivers, so it aims at both all-night comfort and fuller sound. Biggest trade-off: only 3–4 hours of playback per charge, so heavy users will be reaching for the case.
• Yeforu Flat Sleeping Earbuds — biggest strength: a genuinely thin housing at about 5 mm and up to 24 hours of total playtime with the case. Biggest trade-off: the sheet lists no driver size, frequency range or weight, so the sound and comfort claims are harder to pin down on paper.
• YLYHHFY 5.4 is for you if: you want a discreet earbud you can wear alone, you care about a clearly stated driver spec, and you like seeing remaining battery on the case.
• Yeforu Flat Sleeping Earbuds is for you if: you sleep strictly on your side, you want the lowest-profile shell you can get, and you'd rather charge the case once instead of every night.
• Short version: YLYHHFY for a lighter single earbud with more audio detail on paper; Yeforu for maximum flatness and maximum runtime.
The pitch here is simple: a tiny earbud that disappears into your ear and stays comfortable while you sleep on your side. YLYHHFY states each earbud weighs about 3 grams, which is the kind of number that matters when you're lying on your ear for seven hours. The shell uses soft silicone eartips and the brand describes a flat, zero-pressure fit — the classic side-sleeper problem is pressure against the pillow, and a light, low-profile bud is the usual fix.
On the audio side, YLYHHFY is unusually specific. There are 13 mm dynamic drivers, a stated 20 Hz–20 kHz frequency range, and a microphone with call noise cancellation on each earbud. The brand talks up deep bass and mids. In my opinion, a 13 mm driver in a body this small is the most interesting part of the spec sheet — it suggests YLYHHFY is trying to be a real everyday earbud, not just a sleep accessory. Pairing is Bluetooth with auto-reconnect when you lift the buds out of the case, and controls are touch-based.
Buy it if you want one earbud you can wear alone while working or napping, you value a stated driver and frequency range, and you're fine charging every day or two. Skip it if you want to fall asleep to audio and wake up eight hours later without plugging anything in — the per-charge figure won't get you there.
Yeforu Flat Sleeping Earbuds: Who It's For
Yeforu's whole identity is the flat, hidden fit. The brand calls these "night-optimized," and the one hard number it gives is a housing thickness of about 5 mm. That's the selling point: side sleepers barely feel them because there's so little shell sticking out of the ear canal. The earbuds are described as ultra-mini and nearly invisible, and they're explicitly aimed at small ears as well as side sleepers. If you've ever taken a normal earbud out at 2 a.m. because it was digging into your pillow, this is the design brief that answers it.
The second half of the story is battery. Yeforu lists 4–5 hours of playback or talk time per single charge and up to 24 hours total with the charging case. That's a meaningfully better per-charge figure than YLYHHFY, and the case turns it into roughly a workweek of nightly listening before you need an outlet. Connection is Bluetooth 5.3 with an AI noise-cancellation feature for calls, and the earbuds use touch controls with sound isolation. The sheet also lists a waterproof rating and 32 ohm impedance, plus a plastic housing in black.
The honest trade-off is disclosure. Yeforu doesn't publish a driver size, a frequency range or a weight. It also lists the age range as adult and kid, which is a little unusual for a sleep product. None of that means the sound is bad — it just means you're buying on the fit and runtime story rather than on audio specs. In my opinion, that's a fair trade if sleep comfort is your only goal and you mostly listen to podcasts, rain sounds or quiet music.
Buy it if your priority is the thinnest possible profile and you want to charge the case instead of the buds. Skip it if you want to compare drivers and frequency response before you commit, or if you like seeing an exact battery percentage.
Side-by-Side: Which Should You Choose?
• Best for the flattest, most hidden fit → Yeforu Flat Sleeping Earbuds. A 5 mm housing thickness is the whole reason to pick these.
• Best for battery life per charge → Yeforu Flat Sleeping Earbuds. 4–5 hours versus 3–4 hours on YLYHHFY.
• Best for total runtime with the case → Yeforu Flat Sleeping Earbuds. Up to 24 hours total, against 30 hours of standby (not playback) on YLYHHFY.
• Best for audio specs you can actually read → YLYHHFY 5.4. 13 mm dynamic drivers and a 20 Hz–20 kHz range.
• Best for battery visibility → YLYHHFY 5.4. The case has an LED power display; Yeforu doesn't list one.
• Best for small ears → Yeforu Flat Sleeping Earbuds. The brand sizes these explicitly for small ears and a shallow, hidden fit.
• Best for wet or sweaty use → Yeforu Flat Sleeping Earbuds. Waterproof is listed on its sheet; YLYHHFY's doesn't mention water resistance.
• Best for a safety net if something fails → YLYHHFY 5.4. An 18-month warranty description is stated; Yeforu's sheet doesn't list one.
• Best for wearing one bud at a time → YLYHHFY 5.4. YLYHHFY says either earbud works alone as a discreet earplug.
I'd buy the Yeforu Flat Sleeping Earbuds. If the entire point of this category is a bud you can forget about while your head is on a pillow, the 5 mm housing and the up-to-24-hour case runtime are the two specs that actually change how the product feels night after night — and Yeforu wins on both. I'd pick the YLYHHFY 5.4 instead if sound quality on paper matters more to me than runtime, since its 13 mm drivers, published frequency range and LED battery display are real, concrete advantages. But for pure sleep duty, Yeforu is my pick.
FAQ
YLYHHFY lists 3–4 hours of continuous playback per charge, plus about 30 hours of standby once connected. Yeforu lists 4–5 hours per single charge and up to 24 hours total with the charging case. Check the current price on Amazon if runtime is your deciding factor, since the case is what you're really paying for.
Both describe noise handling, but not the same kind. YLYHHFY mentions call noise cancellation on the built-in microphones; Yeforu lists AI noise cancellation for calls plus sound isolation as a noise-control method. Neither sheet describes full active noise cancellation for music.
Yes — waterproof is listed as a feature on the Yeforu sheet, along with a 32 ohm impedance rating. YLYHHFY's sheet doesn't state any water-resistance level, so if sweat or rain is a concern, that difference matters.
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