I too think an electric blanket is the answer.
However if that’s unsuitable and he is just trying to heat one room at night perhaps he could ignore the CH and just use an electric heater in the bedroom. I know the cost per kwh will be much more for electric but the oil filled rad I use for spot heating has an onboard thermostat. This means that when it’s reached temperature it only comes on a few times an hour so the rated kwh is an overestimate. Contrast this with running a whole central heating system and pipe work to heat a sole rad and I think the cost gap will be closer again. An electric heater can also be easily attached to a plug in timer, smart control or room thermostat at relatively low cost.
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Smart radiator thermostats new
Smart radiator thermostats new