A blanket sleeper is seen as safe for infants as it is worn by the child. There is less chance of suffocation which can happen if a child just sleeps under a blanket.

Blanket sleepers are sold in many places, thus their quality and price varies considerably from retailer to retailer. Research is required to find the price of a good deal in one's area. Local children's clothing retailers and many online stores are great places to find such items.

A sleeper railway carriage (or a sleeper, a rail sleeper, a sleeper car).

Polite Sleeper was created in 2007.

The Sleeper Awakes was created in 1910.