Wax ear plugs are generally regarded as the number one choice when it comes to comfort. They are designed to sit over the ear canal, rather than inside it, and will fit any size of ear as they are moldable. Wax ear plugs are a great choice for sleeping because of how comfortable they are to wear- they don't protrude from the ear meaning you won't be in discomfort even when sleeping on your side. In addition to sleep, they're also suitable for study, concentration, relaxation, and general hearing protection in mildly noisy enivornments. They're also a good choice for swimming and other water-based use, but you should generally avoid using them in hot water.