This happened to my husband...while he was sleeping. He felt weird, got up and then fell down. He didn't go unconcious but was close. Unfortunately, he works in health care and got the vaccine to keep his job. I know, and don't judge. Believe me, I begged him not to get it but he just didn't realize, at the time, what was going on. He said that he felt like his body was overheating when this happened. It happened again about a month later but the "attack" wasn't as bad the 2nd time. I feel like I am walking on eggshells and pray for everyone who got the vaccine every day.