Same here! I'm in my 50's, so I often have to wake up to pee at anywhere from 3 - 5 AM. Sometimes I go right back to sleep but sometimes not. Then it's up at 6:15 AM to get the kids going for school (I had kids really late.)

I've just become accustomed to being in a semi-groggy state much of the time. I know it's not ideal, but I'm just not gifted with being a good sleeper. Conversely, my wife can sleep 10 hours in a row if given the opportunity.

In the rare situation where I get 6 to 7 hours of unbroken sleep, I feel fantastic.

Edited for clarity