The length of each REM stage

**Radek1990** · 12-03-2014 10:41 PM

Hi. Does anyone happen to know of any sources where I could find how much on average each REM stage we go through at night lasts? Whenever I research this I find answers like 'In the first sleep cycle REM lasts only about 10 minutes, but in the morning it can be up to an hour long'.
I'm sure someone has measured it at some point; they must have.
Can you offer any help with this?

**ATA** · 12-04-2014 12:07 AM

I try to found some but without luck studies usually do not contains this information and there are also too many factors to found some averages:

You can try it hard way and comapare few hypnograms form The Sleep-EDF Database [Expanded]

maybe you found some usefull info here Distribution of REM sleep in entrained 24 hour and free-running sle... - PubMed - NCBI

**Radek1990** · 12-05-2014 12:53 PM

Wow, that sleep recording database is gold. Thanks a lot. I'd been trying to find stuff like this before, too, but had had no luck. Once again, thanks a million. I would have responded earlier, but yesterday I was sick as a dog, ughh. Anyway, I hope others will benefit from your help as well.
Cheers