I learned this tip from this board and it is great. Bonnie/meclizine is a 24 hour pill. If I know I'll be going on spinning rides the next day, I take 2 the night before and it does make me drowsy, but I'm going to bed anyway so who cares. The effects usualy last most of the next day. Take 2 right before bed and you don't have the drowsy effect the next day, but still have the motion sickness cure.