If you're considering leaving your lava lamp on overnight, it's advisable to switch it off before going to bed. This precaution is crucial because there's a potential risk of the lamp being knocked over or becoming excessively hot, leading to an unusual explosion.
However, when the lamp is in proper working condition and placed in a secure location, extended usage won't cause the bulb to melt or the lamp to explode. Nevertheless, to ensure the longevity of your lava lamp, it's best to turn it off the next day. The recommended maximum duration for using a lava lamp is 8-10 hours.