Restful sleep
From Ardrana
Restful sleep allows a willing recipient to gain full benefit from half the rest; thus, the creature touched gains the benefits of eight hours of rest from only four hours of actual sleep. The creature can be awakened at any time, and may wake of its own volition in an emergency. The orison ends when the creature wakes.
Note: This spell originally appeared in this form in Dragon Magazine 120 for the AD&D game from TSR. Its use here is for the purposes of providing context for the campaign only.