|Covid-19|Disk-over-water method Wikipedia
The disk-over-water method is a technique for causing sleep deprivation in laboratory animals.
The subject—for example, a rat or pigeon—is placed on a disk. When the subject shows signs of falling asleep, the disk begins to slowly rotate, at a few revolutions per minute. The subject must walk to keep pace with the disk, or it will be carried into a pool of water.