Naturally when a person is unwell and frail he will spend time lying on his back staring at the ceiling. He might even try to close his eyes in a sad attempt to achieve unconsciousness, but after hours and hours and hours of sleep there is a part of the body that must crave some form of positive engagement.
But fair warning, best to do away with clocks in the bedroom, because sometimes two thirty one in the morning can lead to mood swing, quickly followed by a sense of confusion with hints of pointlessness.
The clock itself must have appeared in the bedroom sometime during that era I will call "while gainfully employed." It's not one of those wind-up clocks that tick-tocks, nor is it bright enough to be seen in the dark, but it does have a button which if pressed illuminates its dial with soft blue light that stays lit for exactly five seconds.