Relapses at night?

Is it common for relapses to occur during sleep and if so, what is the reason for that?
There seem to be a lot of people who report new symptoms after waking up in the morning. Both of my episodes occurred during the night, but I’m wondering if it’s just coincidence?

My symptoms (numbness) are definitely worse when i wake up. I think dampness affects me as our bedroom is north facing and has higher humidity % ratings than the rest of the house. I’m wondering whether it is the long duration in a humid room or lack of mobility for 8 hrs rather than night vs day per se.