I laugh when I read - just get more sleep - go back to sleep, etc. Or folks preaching on the value of 8 - 9 hours of sleep. Preach on folks, it doesn't work for me.

For my entire life, I have been an "instant awaker" I never have used an alarm clock, nor needed one. When I wake up, I am instantly fully awake, and there is no way I can get back to sleep, even if I wanted or had to. I generally go to sleep about 10:00 - 10:30 pm.

So, like this am, I woke up at 4 am. No sense fighting it. Get up and get started doing something productive. I rarely sleep past 5.

BUT - I often take a 20-30 minute nap during the day, which is a lifesaver for me.