When I finally notice I'm not sleeping enough, mania has already set in. Of course I feel better at that point. My sleep hygiene has become as important as any other part of my self-care and is very much something I pay attention to. I write this being wide awake at 11:10 pm and getting up at 6. Not enough sleep but I feel the meds coming on already.
Doctors say psychosis sets in after 72 hours of no sleep. I must have been psychotic quote a few times and quite a number of times throughout my childhood into my early 20's. Sometimes I didn't sleep any for a week or so. I also know I didn't feel connected to anything those entire times and once it was over it was always very bad.
You have to do what works for you.