Uncommon Wondrous Item/Net, Range 5/15, Thrown, Requires Attunement 

This blanket functions as a net, but its escape DC is increased to 15, and it has 25 Hit Points.
Creatures restrained by this net become affected by the effects of the Sleep (1st level) spell at the end of each of their turns. If they fall asleep due to this item, they immediately awaken if they are no longer restrained by it. 

If a single creature covers themself with this blanket as part of a long rest, they gain extra (1d10 + Proficiency bonus) Temporary Hit Points when they finish a long rest; these temporary Hit Points last until the creature finishes a long rest or until the creature loses attunement.