I have looked over other threads, but haven't really found this problem addressed in a lot of detail, and I could use some help...

When I try to relax my body for SP or just in general, when I begin to lose focus of my body my eyelids seem to lighten and drift open. To avoid this, I have to concentrate on keeping them shut to the point that it's distracting or squeeze them shut which just tenses my face up. Also, once I get them closed, I have enormous trouble keeping them fixed on a certain point. It's not so much that I'm looking around at HI, I just can't seem to keep my eyes from vibrating weirdly or just drifting around.
Any advice is much appreciated