Wearing an eye mask during sleep improves episodic learning and alertness
But wearing an eye mask is nigh impossible for restless sleepers; it slips off constantly. My best solution after trying many masks is an old t-shirt draped across my eyes, which inevitably slips off but at least doesn't drag elastic bands over my face.<p>Anyone know of research showing the effectiveness of varying levels of darkness in a room, from complete blackout to fairly dim?