Dropping acid two nights in a row?

Hey guys, I haven't done any drugs for over 6 months because of my exams and stuff... Now recently I have finished so I decided to drop 1x 100ug acid tab Thursday night, it was probably one of my best most enlightening trips I have ever had (I have broken through on DMT before) and I just couldn't believe what a great trip it was. After I stopped tripping around 6:00am I went to sleep after taxing 4mg of Xanax. I had an amazing sleep, got about 11/12 hours sleep and woke up at about 6:00pm the next evening. Me being me I didn't do any research and decided to drop 2x 100ug acid tabs that same following night around 11:00pm ish... prior to this I took 1mg of Xanax to calm the 'pre flight jitters'. But to cut the long story short I didn't really feel much affect at all, and it was really shit and boring, and about 3/4 hours into the trip I laid my head down to listen to music, and yeah you guessed it fell asleep on 200ug acid 4 hours into the trip. Now I know I could of googled for my answers but I wanted some personal opinions from Reddit! Is it bad to fall asleep on acid? Why didn't I trip? Does your tolerance build up dramatically with acid and that's why I could sleep easy and didn't trip? Do you have to take break in between doing acid tabs? Thanks in advance guys :)