Ha! Here's a roundabout answer. I have always been an early bird. I'm the eldest in a family of six kids. Mornings were total chaos and my mom was a yeller. I got myself up and dressed and off to school before the rest of the house stirred, just to avoid the insanity. I walked to school and liked being there early. I can remember doing this from about second grade on. I was always a reader, so I imagine I just found a quiet spot and read until school started.
I FIRE'd about four years ago, right after I got married. (I had the money to RE, but I was worried about healthcare, so was waiting for ACA to kick in before I pulled the trigger.) Enter unexpected husband, complete with incredible healthcare, and...other stuff. TMI? Sorry. So I gleefully put myself out to pasture three weeks after we eloped.
Anyway, we're FI, but he still works, for lots of good reasons. Our morning routine works like this: Up at 5:00. I make his breakfast and pack his lunch. Then we walk all three tenths of an uphill mile to his work together, arriving no later than 5:58am. Then I walk home and crawl back into bed for as long as I want. In retirement, I have totally abandoned my early bird nature.
Occasionally, there is something I have to do in the early morning. Those days, I come home from walking DH from work, shower and get on with my whatever-it-is-that-must-be-done-early-day, just like I always have. Weird, just weird. But, damn, I'm working really hard not to feel guilty.
I guess the TL;DR version is I basically waste it. But man, it feels good!