Just don’t snore! Just kidding!
Falling asleep during meditation is very common and if it happens to you sometimes don’t be too concerned. When we are learning to meditate we are looking for a balance between focus and relaxation and, in that process of learning, it’s inevitable that from time to time we’ll drift a little too far in either direction, sometimes feeling too tense and at other times falling asleep. Learning how to apply the right amount of effort is a very subtle thing and requires practice. And of course, every day will be different.