I'm having the same problem from a month ago, 4 example, last night I slept at 6:00am, thx God I didn't have course only from 13:00 to 16:00,
and these days, what makes it harder, is that I fast until 17:35 and I drink my coffee at 21:00 which makes me sleep toooo late
and I refuse taking any pills, since if I start, I know I'll never sleep without cos I'm too dependant to any of these thgs!!!