Sleep tracking data and its considerable limitations posts 61–90
This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1 · go to the accepted answer.
Obstructive sleep apnoea: pre-existing OSA can worsen with weight before it improves (apnoea-hypopnoea index goes up as soft tissue inflames before weight is lost). This is self-limited but uncomfortable during active weight loss.
Flagging that the sources on this are thinner than the confidence in the thread suggests.
Post #59 and I disagree about the size of the effect, not about the direction.
Consistency of timing does more for most people's sleep than any intervention discussed in this subcategory.
If this contradicts something upthread, the upthread version may well be the better one.
Narrowing post #63, because the general version has more than one answer.
Appetite suppression and nighttime eating: if nighttime eating was a pattern, appetite suppression changes that pattern. Sleep can worsen if nighttime waking is habitual and now there is no appetite-based reason to wake.
The rule of thumb is fine; the edge cases are where it earns its keep.
The published data on sleep outcomes in this class is thinner than the volume of discussion, which is worth saying plainly.
A sleep diary with times rather than impressions is the only way to tell a real change from a remembered one, and it takes a minute a day.
I had written a reply contradicting post #67 and deleted it. Here is what survived.
Stimulants and sleep: if supplementing with caffeine or other stimulants for energy during weight loss, timing and dose matter for sleep. Evening stimulant use interferes with sleep.
The variance between people here is larger than the effect being discussed.
Energy and sleep needs: rapid weight loss increases real metabolic stress. Sleep needs might increase even though appetite for food has decreased. Prioritising sleep is prudent during active weight loss.
Speaking for myself and not for anyone else who has posted here.
Where a partner reports a change the person has not noticed, that observation is usually the more reliable one.
That distinction has done more work for me than anything else in this category.
Picking up post #70: that is the part I would want checked first.
Sleep hygiene: basics (cool dark room, consistent sleep time, no screens before bed) matter more during energy deficit because stress and sleep need are higher.
On post #72 — agreed on the reasoning, with one qualification.
Eating patterns shift substantially and late intake affects sleep independently of anything pharmacological.
Two sources, same conclusion, and I could not rule out that one copied the other.
Taking sleep seriously for a moment rather than deflecting: the honest position is that the community has observations and no controlled comparison, and those two things support very different sentences.
Collapsed as off-topic by two members at trust level 3 or above
Adding the measurement that post #74 says would settle it.
Caffeine and alcohol both affect sleep architecture and both change during a period of reduced intake without anybody deciding to change them.
Caveat: everything above assumes the paperwork is what it says it is.
That matches what I have seen, for whatever a single anecdote is worth.
Narrowing post #76, because the general version has more than one answer.
Sleep quality versus quantity: some people report changes to sleep duration; others report changes to sleep quality without duration change. Both can matter for recovery and daytime function.
Everything in post #76 holds. The case it does not cover is the one I have.
Energy availability affects sleep in both directions, and a large deficit can produce either fragmentation or unusual sleepiness.
The part I am sure of is shorter than the part I have written.
Building on post #80 rather than restating it.
The published data on sleep outcomes in this class is thinner than the volume of discussion, which is worth saying plainly.
This has been discussed before and I could not find the thread, so, again.
Everything in post #82 holds. The case it does not cover is the one I have.
Caffeine and alcohol both affect sleep architecture and both change during a period of reduced intake without anybody deciding to change them.
This is the sort of thing the wiki should carry and currently does not.
When sleep problems need attention: if sleep does not improve as weight loss continues or if it worsens, discussing with a clinician is prudent. Sleep disorders are real and treatable.
Post #82 and I disagree about the size of the effect, not about the direction.
Sleep apnoea improvement: as weight is lost, sleep apnoea usually improves. The timeframe is weeks to months, not immediate. Improvement often is gradual rather than sudden.
I have left out the parts I could not verify.
Taking post #85 at face value and following it one step further.
A referral for a proper sleep study answers in one night what months of forum discussion cannot.
I would be glad to be shown a cleaner way of putting this.
My understanding of sleep is a few years old and may have been superseded. If it has been, I would genuinely like to know rather than keep repeating it.
Energy and sleep needs: rapid weight loss increases real metabolic stress. Sleep needs might increase even though appetite for food has decreased. Prioritising sleep is prudent during active weight loss.
Scoping that to what I have actually seen rather than what I have read.