If you own a Google Home smart speaker, there are 15 effects to choose from, including running water, a crackling fireplace, rain, thunderstorms, and white noise.
Smart lighting from the likes of Philips Hue and LIFX can be set to dim gradually at night then switch back on slowly in the morning, simulating sunrise and sunset.
The more polluted the air in your bedroom, the less time you will spend asleep.