We sleep better when it's quiet. That's a no-brainer. Incorporating low levels of ambient sound such as white noise or fans helps to mask most household disruptions to a certain point (equipment cycling on and off, clocks chiming, etc.). If necessary, use comfortable earplugs to block the rest (sirens, pets, rude neighbors, etc.). Avoid watching TV in bed, but if your partner watches TV, ask them to wear headphones.