I believe that all these appliances need to be turned off once a day.
I leave my PC open all day and my I pad is on most of the time and only gets physically turned off if there is a problem, which is rare.
I also turn off my mobile at night but that is mainly because it is next to my bed, and it would wake me each time I got a message, or email, and even turning off the sound it would vibrate. Besides which, I do not want messages, texts etc while I am asleep.
I technician once told me that PC should not be turned on and off during the day but should be turned off during the night.
I do not live on my computer so I turn it off when I am not using it! I cannot see the point of it being on all day long,or night either,if I am not using it. I no longer have a mobile phone for general use,so it is only turned on if I am leaving the house.
I use my laptop a lot, so I do not turn it off. But on my phone, I just turn off the internet when sleeping , so that messages and emails don't wake me up. I do keep the phone ON for any emergency calls.
Yes, I always turn off the laptop at night, & I turn of the mobile when i remember too. t usually leave the mobile in my handbag, which I sometimes leave in the lounge room, by mistake, so like last night, it didn't get turned off.