How the sleep communities compare
Membership is concentrated: the three largest communities hold 88% of all members on this list, so most of the sleep conversation happens in a handful of places. Size and activity don't line up perfectly: r/sleep has the most members, but r/sleeptrain gets the most new posts (about 70 a day, against 45 in r/sleep). The oldest is r/sleep, founded in 2008, and every community here is more than five years old — this is a long-established corner of Reddit.
5 sleep subreddits by member count
- Sr/sleep ↗ 631,112 members · ~45 posts/day · since 2008
Good sleep is essential for our health and happiness. Find and strengthen your best habits and help others improve theirs.
- Ir/insomnia ↗ 153,638 members · ~37 posts/day · since 2008
Posts and discussion about insomnia and sleep disorders.
- Sr/sleeptrain ↗ 128,772 members · ~70 posts/day · since 2016
This is a judgement-free zone to provide tips, ask questions, and share success stories about sleep-training your little ones. Whether you want to "cry it out" or you want to try a "no-cry sleep solution" (or anything in between)…
- Sr/SleepApnea ↗ 65,913 members · ~31 posts/day · since 2009
Sleep Apnea
- Sr/Sleepparalysis ↗ 64,410 members · ~10 posts/day · since 2011
Discussion and support for the science of sleep paralysis.
Choosing where to post
If you have a question, start in r/sleeptrain: it is set up for exactly that, and with about 70 new posts a day there are plenty of people around to answer.
Before posting, sort a subreddit by “Top” for the past month: it shows in a minute what that community rewards. Always read the rules in the sidebar first — each community is run by its own volunteer moderators. Our guide to searching Reddit explains how to dig through any of these communities, and the subreddit info tool gives you the stats of one we don't list.
Frequently asked questions
What is the biggest sleep subreddit?
Of the communities listed here, r/sleep is the largest, with 631,112 members, followed by r/insomnia (153.6K) and r/sleeptrain (128.8K).
Which sleep subreddit is the most active?
By new posts per day, r/sleeptrain leads with about 70, ahead of r/sleep (45). Counts are averages over the last seven days.
Where should a beginner ask about sleep on Reddit?
r/sleeptrain is the one built around questions and advice, with about 70 new posts a day. Check its rules and search it first — common questions have usually been answered.
How many sleep subreddits are there?
We list 5 safe-for-work sleep communities with at least 25,000 members each, 1M members in total (people can be in several). Reddit has many smaller ones too; our guide on searching Reddit shows how to find them.
What is the oldest sleep subreddit?
r/insomnia, created on Jan 25, 2008.
Are these sleep subreddits safe for work?
Yes. Every community on this page is public and not marked 18+ by Reddit, and we filter out communities whose name or description points to adult content.
Data: Reddit's public subreddit search and the Arctic Shift archive (Nov 7, 2026), growth from SubMouse's weekly snapshots. Member counts of communities outside our Top 1000 come from the archive and can lag a little. Not affiliated with Reddit.