Like watering, Cactus also needs to get enough light for them to thrive. So find a place in your home where they can get at least 10-14 hours of bright light per day. If they don't get sufficient light, this will affect your cactus overall growth and may start to behave strangely.
 
In order to promote optimal growth of an indoor cactus, it’s important to water it as soon as the soil has dried out completely. In the spring and summer, this could be about every 10 – 14 days.
In the winter, potting soil may take a bit more time to dry out completely. Since the cactus could be in dormancy during this period, water about every 4 to 6 weeks.