Seaweed-Headed Dragon

I always know why, even though it doesn't feel that way...

yes. sometimes your body can simply feel run down. Even the days being shorter can cause a depression (known as seasonal affection disorder) which folks combat with special light bulbs that mimic the sunlight.

I've had that happen once in a while, been a while since it's happened to me. I usually tried to put it to one side and continue onwards. Maybe also watching something funny or uplifting.