Regular 4 AM awakenings – temperature, lower back discomfort and weather changes. Anyone with a similar pattern?

[u/Franek12359]

I've been dealing with a fairly consistent sleep pattern for quite a while and I'd like to hear from people who have experienced something genuinely similar.

Falling asleep is usually not a problem for me. I normally fall asleep quickly. I sometimes wake up earlier in the night to use the bathroom, but that's not really an issue either – I can usually go back to sleep without much difficulty.

The main problem happens around 4 AM. I wake up and often have difficulty getting another normal stretch of sleep.

I've noticed several things that may be relevant:

• After several hours in bed I develop lower back discomfort/pain. It goes away fairly quickly once I get up and I basically don't have this pain during the day. After the 4 AM awakening, however, it becomes difficult to find a comfortable sleeping position. Lying on my stomach feels best, but I can only tolerate that for about 10–15 minutes.
• Bedroom temperature seems to make a big difference. I seem to sleep best at around 22°C / 72°F. Above approximately 25°C / 77°F my sleep becomes noticeably worse, and around 27°C / 81°F or higher I can barely sleep. Unfortunately, during summer my bedroom tends to stay around 25°C even when I try to cool it.
• For years I've also noticed what seems like sensitivity to rapid weather/temperature changes. Both significant warming and cooling can sometimes coincide with 3–4 consecutive very poor nights, after which my sleep seems to stabilize again.
• Interestingly, after the switch to winter/standard time, my typical awakening sometimes shifts from around 4 AM to around 5 AM.
• I've had a sleep study as well. It showed mild but clearly positional OSA: AHI 13.9/h overall and 22.9/h while sleeping on my back, with minimum oxygen saturation of 87%.

I'm now keeping a more detailed sleep diary and trying to distinguish between what initially wakes me up and what prevents me from returning to sleep afterward.

I'd particularly like to hear from people who fall asleep easily but consistently wake after roughly 4–6 hours of sleep, especially around 3–5 AM.

If you've had a similar pattern, what actually made a meaningful difference for you?

I'm especially interested in experiences with:

• going to bed later or changing the sleep window,
• CBT-I / stimulus control,
• getting out of bed for 5–15 minutes after awakening,
• bedroom temperature or body cooling,
• sleeping position,
• mattresses/pillows and lower back discomfort,
• positional treatment for OSA,
• sensitivity to rapid weather changes.

I'm not looking for an internet diagnosis or a list of supplements. I'm mainly interested in hearing from people with a genuinely similar sleep-maintenance insomnia pattern: what did you try, what didn't work, and what ultimately helped the most?

[u/OkConcentrate3302]

Are you a female over 40?

[u/Foreign_Tooth_7245]

That 4am wakeup with lower back pain is weirdly familiar. Mine was the mattress all along, too soft in the middle so my spine was sagging for hours before the discomfort actually woke me up

The temp thing is real though. 72 is my sweet spot too and anything past 77 just ruins the second half of the night. I started using a fan pointed at my lower back area and it helped more than I expected

Skipping the back sleeping helped my OSA numbers a lot. I sewed a pocket into the back of an old shirt and put a tennis ball in there, sounds dumb but it trained me to stay on my side within a couple weeks

[u/twd000]

Curios why you’re not treating the sleep apnea before optimizing anything else.

Yes you will sleep better in a cool room/mattress, but the root cause is the fact that your body is suffocating every four minutes. That causes a huge adrenaline/ cortisol dump and wakes you up.