Moderately stressful with high turnover
At night the first few hours guests come to check in, check out. This is the most stressful part as it is the most time sensitive. Also by the night not having the right rooms or any rooms is sometimes a problem due to overbooking. This is difficult to explain to the guests.
You're expected to stand at the reception, which is where you spend most of your shift.
The main source of stress is that at night, training is minimal and rather than being performed by the management, it was performed by less experienced staff members, thus for a long time you can feel you don't know enough. Fortunately the night manager and other colleagues are always available when the new person doesn't know something.
In the middle of the night things become quieter. There are some administrative tasks, but normally there are a few hours when you are just on standby in case a guest comes. Browsing the web was allowed in that time.