One of the reasons that I never sleep in is that it is so very incredibly frustrating just to try!
For instance, when I found myself still engrossed in Dickens "David Copperfield" this morning at 3:00 AM, I promised myself that I would sleep in. But I finished reading at first light and drifted off only to be awakened at 8:30 AM by the neighbor's grass cutter.
It happened last Saturday, too. After the KGK camp finished on Friday I stayed in Hirosaki for a Pizza Party that night meaning to be up and away first thing in the morning. - only to become deeply embroiled in an important conversation around midnight! When I finally crawled into bed around 2:30 AM I naturally promised myself that I'd sleep through all my usual morning routine. But it was not to be. The dog across the street insisted on waking the neighborhood at some ungodly hour. I finally gave up pretending to sleep at 7:30 AM and went through my routine as usual.
The moral of this story - bed before midnight.
As I used to tell my children - the key to good (mental) health is to go to bed at night, get up in the morning, eat three meals a day & walk, walk, walk.
I. e. Live a life of quiet MODERATION.