Plants get droopy half way through the day

wohlmöglich das sie echt genug licht hatten ich beobachte dies immer am ende des tages so 1-2h bevor die lichter ausgehen das sie langsam ruhe haben wollen am nächsten morgen sind sie wieder fitt ich habe aber nur 150w keine 600w vieleicht hilft es die intensität des lichts runter zu fahren da sie ja eh in Veg sind und die voll 600w nicht benötigen

In my belief plants wake n sleep as humans do.when they droop I believe there due for a sleep cycle and are clearly indicating they have finished there days cycle and ready for rest.

Some believe cannabis plants have circadian rhythms. Does it happen precisely on 12/12 schedule? Cuz this happened with my first grow. I knew to take pictures at 11am because that's when the leaves looked most "awake". She was an otherwise mostly healthy mini-monster of a grow, so I chalked it up to circadian rhythm. Guess I'll never truly know. This did not happen with my second grow, however. She looks great, btw, Good luck!

The drooping could be caused by plants losing moisture through their leaves. This is a natural process called transpiration. Plants that have adequate moisture may droop in the daytime and revive without assistance as the temperatures drop in the evening and the plant's system balances out.