It's amazing how badly designed many hotel rooms are for actually sleeping in:

* Lots of LEDs on televisions, AC controls, clocks, telephones, smoke detectors, light switches, etc, etc.

* Curtains that leak light around the edges or between curtains.

* Noise from minibars and AC. Constant low pitched AC noise is acceptable, but not high pitched or intermittent.

Hyatts tend to be particularly bad - the rooms seem to be designed to be pretty rather than practical.