1652/1 - Ibn ‘Umar (may Allah be pleased with him and his father) reported that the Prophet (may Allah’s peace and blessings be upon him) said: “Do not keep the fire burning in your homes when you go to bed.” [Narrated by Al-Bukhāri and Muslim]
1653/2 - Abu Mūsa al-Ash‘ari (may Allah be pleased with him) reported: “A house in Madinah caught fire with its inhabitants inside. When the Prophet (may Allah’s peace and blessings be upon him) was informed about this matter, he said: ‘Indeed, this fire is your enemy. So put it out before going to bed.’” [Narrated by Al-Bukhāri and Muslim]
1654/3 - Jābir (may Allah be pleased with him) reported that the Messenger of Allah (may Allah’s peace and blessings be upon him) said: “Cover the vessels, fasten the waterskins, close the doors, and extinguish the lamps, for indeed the devil does not loosen waterskins, nor open doors, nor uncover vessels. If one can find nothing to cover his vessel with other than a stick while mentioning the name of Allah, let him do so, for a mouse may set a house on fire with its inhabitants inside.” [Narrated by Muslim]
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1) It is prohibited to leave a burning fire in houses when going to bed lest it should set the house on fire.
2) It is recommended to cover food vessels and close water tanks to prevent insects, dirt, epidemics, or anything harmful from falling therein.
3) It is recommended to shut the doors before going to bed.
4) One of the means of protection against the devil’s cunning plots is to regularly recite the Shariah-approved supplications.
There is nothing wrong in leaving electric lamps with dim light turned on during the night. The reason behind the prohibition above is the fear from burning, a possibility that does not exist with electric lamps, and Allah knows best.