my plants leaves are curlying

my plants leaves are curlying and i dont know why what should i do

My plants leaves have the same problem at the moment but mine is definately caused by it being slightly to hot in my cupboard,until i have saved up for an exhaust fan etc. theres nothing i can really do about it,as you havent provided any pics or feeding schedules i cant really help you other then to say to hot,to wet,to dry and to much fert/nute will cause this