[Music] So, this is a nightmare. Um, did you ever experience a a dream of being chased by a big monster or falling up from a cliff downwards. These are nightmares.Nightmares are defined as extremely dysphoric dreams that typically wake you up. Typically, you wake up before you're hitting the bottom of the cliff or before the um pursuer captures you. So, these are nightmares and typically when you wake up from a nightmare, it's in the second part of the night and you can recall this nightmare story quite goo ...