I used to do mine in the afternoon after lunch. I only did my relaxation cd really. I did affirmations this time but not the first time. I listened to them in the car I had it printed out on my fridge too from when Oskar was born and it's actually still there now lol, over 3 yrs later. I still glance at them cos there's more to it than birthing anyway. With the relaxation and affirmations really there isn't a huge problem if you do fall asleep as it goes in the subconcious - bit like subliminal messaging lol. All the best with your birth! I found hypnobirthing wonderful and did my last 2 drug free VBAC's. I remember not being aware of my surroundings at all for long periods of time. It's a great way to birth