Why do I feel super motivated to fix my life at night, but completely lose it the next day?

This has been happening to me a lot recently. Usually around midnight, I suddenly feel very clear-headed and motivated — I start planning things like fixing my sleep schedule, working out, eating better, being more productive, etc.

It all feels very real in that moment, like I’ve finally figured things out.

But the next day, I either feel too tired or just don’t have the same mindset at all, and I end up doing none of it. Then the cycle repeats again at night.

Is there a psychological reason for this? Or is it just a discipline issue?