perky and droop and perky and droop

what the casue of this everytime i put my month old plant outside during the day it really perky and when nite times comes i put it indoors with a 45 watt cfl and it starts to droop so next moring i put it outside and it perky again then i put in inside and it starts to droop again what the casue of all this perky and droop and perky and droop stuff

because there is much more light outdoors, also, it is going through alot of stress with the switch so you should find a way to deal with that.