Hi Pennyplant,
I think of what you describe as shedding a skin. Suddenly you didn't need that nervous defensiveness, or lacked the energy to produce any, so it fell away, and you felt better. And noticed and embraced feeling better. Hope and blessings, PP, that you keep feeling better, lighter, even with more sleep.

Re. sleep deprivation, I'm a lifelong insomniac. Tried everything, many health consults. The most conclusive answer I got was from a renowned sleep-disorder specialist, who said I was 'wired wrong' and possibly had an adrenaline imbalance. I probably would have pursued futher answers, but then I got sick, really sick. It took me 2 hard and mostly sleepless years to get diagnosed (spent a full winter bedridden) with a chronic illness. Emotionally and physically, getting sick was my before and after.
I'm pretty careful about my health, and mostly well enough that no one who isn't medically attuned would guess what I'm living with. The bad news and good news are the same: the person I was before is gone. There are things I can't do, but a lot of my wasted energy traps fell away. Like shed skin. It didn't feel like a choice: more like what illness imposed. Maybe a case of physical reprioritization.
I'm much more aware now of the way I experience and hold stress physically. The negative consequences, in particular, of certain emotional loops and defenses. Which serves as a powerful motivator/teacher as to what's truly essential, and the emotional gift of being here now, living in the moment. Something I don't think I was capable of much in my 'before'. I grew up as the family's mood manager, throwing myself at everyone else's pain and stress, with no real idea of an emotional self at all.
Then God slowed me down. Showed me how it felt to accept, down to the core, that I was doing my best, with all the wonderful limitations 'best' can include. To finally learn how to say 'I can't' and 'I need'. That was my new, jaw-dropping, mental phrase for years, PP: Wow; this is
Me, Doing my Best.
imho, with a lot of focus, support, and luck, everyone has the opportunity to shed many 'selves' in a lifetime, and learn from who's underneath. Like those Russian nesting dolls, matrioshkas, only in reverse: instead of getting smaller we feel bigger for all the emotional baggage we can learn to do without.
Amor Fati; love what is. Especially what's inside.
(((PP, Hops, Stormy, Hope, Write))) and everyone who wants one ((()))
luck and love to all,
LoH