If you see someone having a seizure in their sleep, it's essential to ensure they're safe and unable to hurt themselves. Some ways to do that include: Make sure there are no sharp objects or items that can cause injury near the person. Do not try to hold them down. Lie them on the floor; if possible, place a pillow under the head. Put them on their side to ensure a clear airway. Time the seizure. If the person is having difficulty breathing, call 911.