Iguanas are like human. They are fully awake in the morning but needed the darkness of the night to be able to sleep and rest. This is one of the things you have to consider if you have an iguana.
In pet stores today, you will be able to find an assortment of iguana shelters that are complete with the necessary equipments that you pet will need. For example, there are cages available that comes with a bulb that serves as light as well as a heat source for your iguana. Heat is vital in maintaining the body temperature of an iguana. Some owners go to the extent of monitoring temperatures and providing heaters for these pets.
Those who cannot afford these things opt for the more conventional approach of turning lights off in the evening so the iguana can rest. But the problem with this set up is that there is no additional source of warmth supplied to the iguana. In these cases, you may find drifting off to a corner or a place where these reptiles find the heat that their body needs.
For those who want to maintain an orderly temperature monitoring, there are timers that they can buy to ensure that everything is kept well in order. Keep in mind that iguanas thrive mostly on outdoor forest temperatures. That was their home before they were in captivity. It is therefore important that you maintain what they have gotten used to so that they will not find it hard to adapt to their new environment.