When you are sleeping it takes longer to wake up to the signs of a fire and if you don’t have a working smoke alarm there will be nothing to wake you up.
Make sure that cigarettes have been put out properly. Never smoke in bed.
Make sure all candles are out. Never leave one burning when you go to sleep.
Turn off your electric blanket. Unless it has been designed to be left on overnight and has a thermostat.
Make sure the washing machine, dishwasher or tumbler dryer are not running overnight.