I get so many questions about dormancy and Venus Flytraps that I want to be very specific. You must give your plants a dormancy period. If you do not know if dormancy is approaching, but winter is near, assume your plants require dormancy. If it is the middle of winter, assume your plants require more dormancy. Dormancy temperatures should be chilly but not freezing.
Sunlight is fine.
Sunlight is not crucial during the dormancy phase. About two or three months is sufficient. After this, the plants can grow just fine for another season. It is best if you can give your plants some light during the winter. You can do this if you can store your plants outside in some chilly area for the winter.