A lot of stuff can be stored under the bed. But we made our own bed to do that. I wonder if we’re the only one in America like this:
1. We bought plastic shelving similar to this (but not this):
http://www.homedepot.com/p/Sterilite-5-Shelf-36-in-W-x-75-125-in-H-x-18-in-D-Plastic-Shelving-Unit-1-Pack-01558501/202572469?keyword=01558501
2. It took a couple of boxes of shelves and we arranged them like this (legs will be left over):

3. Then we laid some nice flat 2’x4’x3/4” plywood on top (qty 3):

The scaling is way off but it’s 4’ x 6’ floor space; smaller than a double bed.
4. Then we cut a 4’x6’x2” of soft foam to put on the board. Then we laid a 4×6’x2” hard foam on that:

We experimented with several foams and density combinations and this is what worked for us (i.e., no back aches).
5. Our head board is from a double bed from a garage sale. It’s not attached to the bed. It’s actually attached to the wall to make it look like the bed has a headboard.
Other notes: We had to bolt the boards together because they would slowly separate. We used thin metal and small wood screws. Double sheets and blankets might seem a little big but it sure made it easier to straighten in the morning. People think this is small. But my wife and I could get by with just a twin bed (36” wide). But the extra foot width gave us some moving room. My wife put a lacey sheet over the wood before we put the foam on (maybe it’s called a bed skirt). This hid/covered everything underneath the bed. Now we have 4’ long boxes that easily slide underneath the bed. When people lift up the lacey sheets, it’s rather surprising how much room is under there since we actually only have a ‘four-inch‘ mattress and no box springs. In fact, you can have more room by using taller book shelves. We assembled this 8 years ago and the bed is still great. It went through a move and is still behaving.
Another storage place my wife uses– is those tripod lamp tables. She puts a sheet over those and hides several items under there.
Happy Storage,
-Barry
-The mountains were made for Tevas