The Moon shows up as a thin sliver of light in the east, before dawn. Last visible phase of the cycle. It keeps fading until the next meeting with the Sun, the next New Moon.
The pattern
Quietest phase of the cycle. Social and productive energy at the lowest point. Urge to sleep earlier, eat lighter, talk less.
Not melancholy. It's the stillness before the restart, the moment when body and mind prepare for the next New Moon. Forcing performance here usually costs more than it pays.