During brumation, which is a period of dormancy or reduced activity in reptiles, it is generally recommended to adjust the environmental conditions to mimic the natural hibernation conditions of the reptile species in question. While specific requirements may vary depending on the species, here are some general guidelines:

1. Temperature: Most reptiles that undergo brumation require a cooler temperature range than their regular active phase. It is essential to provide a cooler area within their enclosure. However, abrupt and extreme temperature changes can be stressful for reptiles, so it's advisable to create a gradual transition to the lower temperatures rather than immediately turning off the heat source. Consult species-specific care guides or seek advice from a reptile veterinarian to determine the appropriate temperature range for your reptile during brumation.
2. Lighting: Reptiles typically experience reduced daylight hours and lower light intensity during brumation. Some reptiles may require complete darkness during this period, while others may tolerate some low-level lighting. Research the specific lighting requirements of your reptile species to determine whether you should provide any light during brumation.

It's important to note that the decision to allow your reptile to brumate should be based on careful consideration and proper research. Not all reptile species require brumation, and it may not be suitable for some captive reptiles due to various factors such as health conditions or improper husbandry practices. If you are uncertain about whether your reptile should brumate or how to properly care for it during this period, consult a reptile veterinarian or an experienced reptile keeper for guidance.