Sleep Sounds + White Noise is an Apple TV app that plays 77 soundscapes, 14 Dolby Atmos tracks, and 12 looping HD video scenes, layered into saved mixes that keep working offline. The same app wakes you with a sunrise alarm, so one device covers the whole night.

77 sounds, 14 Atmos tracks: rain, ocean, waterfalls, white noise, and ASMR, layered with independent volume controls into favourites that are one click away.
Sleep and wake in one app: 4 guided sleep meditations, 6 breathing patterns, a sleep timer, and a sunrise alarm with separate weekday and weekend schedules.
Monthly, yearly, or once: $2.99 a month, $19.99 a year, or $29.99 once for lifetime access, with all future updates included.

A total black screen mode keeps the television dark all night with an optional clock, and the sound library needs no internet connection once installed.