like it was terrible [SEP] I don't know what it is with this cap but it leaves stains on your bed. When I first wore it to sleep, I woke up the following morning to see horrid blue stains on my pillowcase, like it was terrible. All over the pillow case, I hand washed my pillow case, and some of the marks are permanent. I mistakenly left the cap on my bed this afternoon before heading out. I came back to see the same monstrous bluish black stains on my bedsheet. I am so frustrated with this. To think I trusted the reviews before buying it. I feel like I wasted my money. Oh well.