Review (4/5): More comfortable to sleep in than foam rollers
These are very comfortable for me to sleep in, as the part that rests against your head is flat. Even more comfortable to sleep in than pillow/foam rollers! Recommend to wear a scarf or other head covering at night, otherwise the edges/springs may catch on your sheets as you roll around at night and cause pulls or rips in the fabric. My hair often gets snagged in the springs, so I have to be gentle when taking them out in the morning. Beware if you sleep with a partner!! You WILL poke them painfully if you try to rest your head against them at night.