Ringing is almost all the time. It is very nerve racking
The condition is called tinnitus. See below link:
Ringing in ear i.e tinnitus is often noticeable when the surroundings is quieter like at night when you go to bed. Any noise in the room, like a humidifier, dishwasher or white noise machine can help mask tinnitus and make it less irritating.
Get enough rest. Try to sleep with your head propped up in an elevated position. This decreases head congestion and noises may become less
Avoid alcohol, smoking, caffeine and loud sounds.