A healthy sleeper will toss and turn as many as 30-70 times a night, making width important too. The width of the bed is particularly important if you sleep with a partner. A standard double bed (135cm) gives each person just 69cm of space, which is narrower than a single bed (wheelwright-inn.co.uk).
Wall clocks can be electrical or battery powered. They can also be mechanical. Mechanical clocks have a weight attached to a cord and wrapped around a pulley. Since clocks are always running, there are most times a secondary power source. These can keep the clock running temporarily when there is a disruption in the main power.

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