have you received junk messages,especially at sleep time?

Years sometimes I to get junk sms when I'm sleeping and because of that I'd make it a habit to put my cellphone on silent mode when I'm going to sleep. For me the night to sleep is very important. It is the sole reason of keeping a person healthy. And so I do not want to to be disturbed when I'm sleeping in the night. Moreover it is someone is rarely in disparate needs and want to call me he can always call me at the landline number which I have. So if the urgency is greater than he can contact me in some way possible but if it is not so urgent then no one can disturb me by calling them in the night-time.