They're really weird, up to being unpleasant (also had them when working on a toy OS, but once I also had an XML related one; cannot recommend).
However, they are downright tortuous if they come as fever dreams (though fever dreams are of course unpleasant no matter what the subject, and are often hard to willingly wake up from, since you're having a fever).
However, they are downright tortuous if they come as fever dreams (though fever dreams are of course unpleasant no matter what the subject, and are often hard to willingly wake up from, since you're having a fever).