This is very, very easy. You don't need wood or a saw like most instructables. All you need is shoe boxes, 2 large plastic cups, balance, and very steady hands.
Step 1: Start to Build
Start to build by putting your cups on the bottom, then add a shoebox on top.
Step 2: Almost Done
Add your next shoe box
Step 3: Repeat
Repeat step two until it is up to your bed
Step 4: Done!
Now put an alarm clock on it, Maybe your phone? Who knows? Hope you like it!