I tried these for the first time last night over my prescription glasses, to block blue light and help me sleep better.  I put them on as soon as it got dark outside and kept them on every minute until I turned out my light and went to sleep.  (1) I looked a complete nerd in them  (2) They made things a lot darker.  But when I woke up this morning feeling rested, and went all day long at my office job without feeling fatigued or sleepy, for the first time in maybe months but probably more like years, all was forgiven.  Another plus: I have a large head but there was plenty of room in these for my head and my glasses, and they were very lightweight and stable on my face.