The best way to re-create this humidity cycle is to mist the enclosure with a pressure sprayer every evening, after lights out, and then let it dry out. This means that it’s important to use an enclosure with excellent ventilation, especially if you live in a humid area. If your skink’s enclosure isn’t ventilated well enough, then it won’t be able to dry out adequately during the day, and things are likely to get too damp for your skink’s comfort.
In addition to creating a natural humidity cycle, regular misting will also help add moisture to the substrate. This is particularly important if you have a bioactive setup, but both of these factors combine to help make sure your skink stays well hydrated.
Humidity levels can be monitored by placed a digital probe hygrometer in the middle of the enclosure.