A couple people here have asked me about this before so I thought I'd just make a fast post and be done with it. I found out how to overcome sleep during deep somatic meditations, it's incredibly simple. I was reading about how Bodhidharma didn't like the fact that so many monks were sleeping when he visited China. However, in our linage, we let the body do whatever it needs to do at the moment. I personally didn't feel like I was achieving any sort of satisfactory meditation when I would fall asleep during practice, so I found a happy middle ground: Just pay attention to the sleepy feeling. Where exactly is it coming from? When I was deeply relaxed and the sensation of needing sleep came, I did my best to observe EXACTLY where it was coming from. It was coming from certain "bands" around my head and my heart. I just observed the energy in them and relaxed into it - no judgement just slowly relaxing into the energy that was there and that allowed me to go way, way further into myself than just sleeping could. That was a kind of snooze, but at the same time, I was fully aware of what was happening and I felt a tremendous level of energy within. Additionally, I sometimes get restless and bored during meditation when I know that I'm nearing the end and I did the same process - where is the boredom/restlessness coming from? Relax into it, observe it and it disappears and melts away into emptiness. I can't believe it's taken me this long to figure it out when so many wise teachers have already told me about that lol! By the way you can use this tool to not just combat sleepiness, but depression, pain, etc... Hope it helps.