Ah, where to start...... Lets start with the why

I don't have much time during the day due to my parents being about or the level of school work i have to do recently to do anything during the day. This really only leaves the night, i use to do it all at night when i went to bed but more recently that i have got into rope and stuff nearly all of my bondage happens at night and i nearly always go to sleep in it. As for story's their is not much i can say, i have had too many experiences but a few do stand out to me (like the time i was home alone for the weekend and did a hog tie to sleep in.... got too warm and only managed 2 hours) but i can say a few general stuff about it all.
The main thing you need to make sure if it is a normal position. Don't try to sleep in something like a frog tie or a hog tie unless if you want to feel very sore in the morning. Event sleeping with your ankles tied together will hurt the first time you try it, as the ankles dig into each other as you sleep and begin to hurt. All it takes is practice to get use to it, start of slow and build it up as you want, but trying to make sure that at all stages you are in a 'I' shape. This shape you can easily sleep in and it wont hurt too much when you wake up.
Feel free to tie your wrists as well, or what is quite fun is to tie your wrists and then tie them with a longer rope to your ankles, but always remember you will have to sort this all out in the morning when you wake up. As for me, when i wake up it is to an alarm that i have on the other side of my room, not too far away. So when i wake up i jump out of bed and turn of the alarm, always more run if you forget that your tied when you jump out of bed

And as for how clear it is. Well, i have never been caught doing anything at night, but it has been prity close..... closest i have ever been is when my brother wanted to talk to me on the phone, and my sister knocked the door to give it to me just after i tied my wrists together... luckily got them free in time. But if you build it slowly and be careful (e.g. wake up early to give time for marks to go down, wear long sleeve shirts and stuff to hide the marks) then you should have no problems with not getting caught.
Now as for how often, would say very, at one point it was 6 days a week, now its more like 2 as i am becoming more lazy due to working too much at school and as it is getting hotter (you will be surprised how much tempture affects your decision to do a tie or not).