my plant is frowning

is it normal normal for a plant to frown during its sleep cycle? It get's back up and smiles in the day time, but just seems to get the blues during the night. Its about a month old and just started doing this.

its called rest .. thats why a dark period is so important .. its not frowning its drooping, during the day if this happens water, if soil seperates from pot, than transplant ..otherwise its normal