'return to sleep' is a correct and usable phrase in written English.
You could use it in a sentence such as: "Feeling tired, he decided to return to sleep for a few more hours".
And so, eventually, I return to sleep.
I often can't return to sleep for an hour after this.
Then they would return to sleep on mattresses on the floor.
He would awake in a panic, and struggle futilely to return to sleep.
Her consciousness was hesitating at a crossroads between hyperactive wakefulness and a return to sleep.
Apparently it is a child with a runny nose or a fever — or anxieties about making potholders — who cannot return to sleep.
Though doctors told Day that he had suffered a freak accident, and it took several days before he could return to sleeping in the room where the accident happened.
Ibrahim Mubarak, a village spokesman, said he was among some who now expected to return to sleeping on the streets; he scoffed at the relocation site, a fenced lot far from commercial or social services.
Readjust your sleep schedule so that you return to sleeping around a schedule based on local time.
You may need to break them of the waking habit later, but most likely they will return to sleeping on their own.
He returned to sleep "overwhelmed with joy," he said.
