Sirius fell asleep easily. In Remus' lap as a dog, on the floor, curled up on a rug in front of the fire, in the most uncomfortable of armchairs, in Remus' bed. Sirius could fall asleep whilst flying. It scared Remus to death, the swiftness with which sleep could claim his Padfoot. It made Remus fear, irrationally, that if sleep could find Sirius wherever he go, then perhaps death was, at that moment, and at every moment that followed, right around the corner, just waiting for the opportune moment to snatch Sirius from Remus' life and leave him alone forevermore.