Night sickness
From The Stargate Omnipedia
Sickness described by "flashes" of memories from deep inside the minds of workers beneath the icy surface of P3R-118. It is highly likely this term is a cover excuse for one who has had their memories of their real life covered by a memory stamp. If a worker is found to be night sick, he or she is immediate confined and their new persona re-stamped.
KEY EPISODE
Beneath the Surface - Members of SG-1, their memories recently stamped with new ones, believe they are all experiencing night sickness.