How does thinking of dreams cause sleepiness?
Cute tags. I think this is a highly individual question. It does make sense that thinking about your waking life (“stressful things like work or things on my to-do list”) would bring you into full consciousness. On the flip side, the concept of dreams seems to be intimately linked to sleep for you. For example, if I have recently broken up with my girlfriend, thinking about the first song we listened to (or hearing it) might bring me back to the “sad” state I associate with her. In this case, thinking about dreams seems to be connected to sleep. Our emotions, dreams, and thoughts are a complex web – thinking about dreams = sleep, which produces an affective state. See here. Also reading about psychology and the way our emotions can be manipulated and created by our thoughts are also subjects to dig deeper into for an extended answer to your question.