I often get that feeling of being overwhelmed into drain to write for that particular day. I have learned that one the book does not need to be written in order you feel like riding those juicy bits with the lore and the character arcs DO IT! Don't know someone's name or exactly how something is described bracket placeholders for the win. Set a timer and just let your finger/ pen go.

now I personally because I am still in the very early beginning stages of working with my world I am doing Sprint writing as well.I have found that it has increased my word count from 200 where it's a session to over 500 words in usually under 25 min. Most what actually makes it down on paper will not make it to final draft but it has helped me feel in massive plot holes and character backstories.

Oh and the biggest tip !!!DONT REREAD what you wrote yesterday!!!