Night exists without being a failure of daylight.

Darkness is not a lapse in the day; it is a half of the cycle with its own work to do. Rest, repair, quiet, the things that only happen when the light is gone. Treating it as a deficiency is a mistake we make about our own low periods too.

When you hit a flat stretch, resist reading it as failure of the good stretch. Ask what it might be for. Sometimes the honest answer is recovery, and letting it be that instead of fighting it shortens it considerably.