Nights of wakefulness, 3am awareness, or needing much less sleep
Sleep becomes impossible or dramatically altered during the awakening process. Accounts describe lying awake for nights, waking at 3am in states of heightened awareness, or requiring much less sleep than before, sometimes for extended periods of months or years.
Several accounts describe the wakefulness not as insomnia (lying awake troubled) but as a kind of alert, clear presence that simply doesn't want or need sleep in the ordinary way.
What I find especially when I'm on retreat but there are days like the last two nights, I've basically been awake all night long, watching my body sleep.
There was so much energy running through me, I was really not sleeping well.
After the shift, there was no sleeping and I was more rested than I had ever been.
While the yogi is one who is awake to and knows his or her true nature across all states, even sleep, and I think you meant that literally.