Doing so could put your household at risk in the event of an electrical shortage and a fire. · it may be appropriate in certain situations to leave a minimalist christmas tree up all year, but there is never a safe time to leave holiday lights on in your home overnight. Leaving a tree plugged in overnight can increase the risk of fire or electrical hazard so its best to unplug when you go to sleep or leave the house. · is it safe to leave your christmas tree lights on all night? · as appealing as it may seem, it isnt safe to leave christmas tree lights on all night. You should always turn them off for several important reasons, says licensed electrician david miloshev. · yamen mahfoud, a sales director for a los angeles lighting company, was unequivocal: · “we typically do not recommend leaving indoor holiday lights on overnight, says rick sheets, vice president of monitoring and compliance for brinks home. · you should turn christmas tree lights off at night to conserve energy and prevent unnecessary fire risk. This is because they can get too warm and sometimes overheat, which may lead to electrical fires. As magical as a glowing christmas tree looks at night, its best not to leave the lights on while youre sleeping or away from home. Modern christmas tree lights are safer than older designs, but will still wear out quickly if left on all night. The wiring on lights can degrade over time and you never know what could happen when theyre unattended. “ never leave christmas tree lights on overnight or when away from home because even led lights can develop electrical faults that create fire hazards when unattended. ”