“He shot at people and got blown up. Bombs went off within feet of him. The explosions rattled his brain. He relived these scenes, over and over, in nightmares.” While he had unusual experiences, Andrew Petrulis was faced with a common symptom: Insomnia. It was a problem he couldn’t solve, until he curled up under a seventeen pound blanket.

+ More from Motherboard’s exhaustive series on sleep.