Those are just things your Tamagotchi does. IT's the same as your daily life. Taking shower, brushing their teeth, looking at the sun or watching TV. Bandai just tried to make it as realistic as possible. At a certain time everyday your Tamagotchi will go to bath. While bathing if you want to play with your Tamagotchi simply just press a button and it will stop bathing and return to the main screen.
It only looks at the sun, watches TV or sitting next to a Christmas tree when you haven't played it for a while. Just like what ilovemakiko said, it's like a screen saver.