If you live in a small house or condo it's still going to be loud enough to wake you up in the middle of the night when it starts. It's a bit more difficult than making a quiet dishwasher (which I'd still find too loud to start running in the middle of the night) since a dryer has to move a bunch of heavy, wet clothing around and run a fairly strong fan to avoid starting a fire.

Time of use plans generally have lower rates starting late evening. There's no reason to run the dryer or dishwasher in the literal middle of the night. An hour before most people's bedtimes will still be during a lower tariff period.

According to https://www.energysage.com/electricity/whats-the-cheapest-ti... 9pm - 6am is common in the US. Hardly anyone is in bed by 9pm.

In the UK it's 10pm - 5am or midnight-7am, depending on your plan. https://uk.jackery.com/blogs/knowledge/when-is-off-peak-elec.... But there's also a mid-day slot 1pm-3pm which can work if your dryer can be timed.

You can also dry heavy items on a folding rack so the dryer doesn't run as long.

Seems weird. Dishwashers, clothes washers and dryers are the epitome of "white noise" to me. I love sleeping with those things, drowning out all annoying noises and ensconcing me in a pleasant ocean of peaceful wooshes.

The last time I had in-unit W/D, it was right outside my bedroom. Never bothered me in the least. Certainly not compared to the neighbors' dogs, pot-smoking, screaming arguments, etc.