My experience with wood flooring is the opposite I switched to tiles.

I find wood flooring can make a room stuffy esp at night... the wood floor traps heat during the day and releases it at night

Could be arthurlwf pasang aircon at night...

arthurlwf is your room air-conditioned...?

How high up are you...?

The higher you go the colder it gets due to decreased air pressure. Like Genting due to its high altitude the climate is cooler.

I've read somewhere the general rule of thumb is somewhere around 1deg to 0.75 deg Celsius cooler per 100 meters.

Since clay tiles are inert like stones it has no way of becoming cold or hot on it's own.

Usually tiles are cold or hot depending on the surrounding air temp.

Tiles are good at absorbing and transferring heat. It's the reason why you get gold feet on tiles and not wood flooring

Wood is a poor thermal conductor...

In the kitchen it's probably due to the heat from your fridge.