“If you’re in a band playing 8pm until 2am, the change is tough. All of a sudden, after playing a long 6 hour gig, ya gotta play another hour? PITA
Seriously, the problem you have is that altho you have plenty of advance warning, its hard to get to sleep earlier than your internal clock is set for. Buy yourself some 1 mg. Melatonin tablets, and take one of them an hour before your normal bedtime and go to bed. Its not a drastic measure, melatonin is made by your body. My doc recommended it to me after asking how well I slept. Which wasnt all that well before I started taking melatonin routinely.