Being hemmed in by wardrobes, putting a bit of a shelf to take reading-lamps, books, glasses, etc. behind the bed-head might be worthwhile, even if it meant sacrificing some of your space at the other end.
I made our bed a bit higher than usual. It's about 60 cm to the top of the mattress, which makes it easier to get into and out of if you're injured or ancient, and easier on your back to make. No, I wasn't decrepit when I made it 25 years ago, it just looked like that in the photo I worked from. The bed spring - people seem to be calling them slats, which for me are just a part of the spring - fits snugly into the main frame and doesn't move much because I designed the bed around the frame. There'll always be
Paris wood movement so it will always move a little, but that's where candle wax comes in.
Rather than building a rigid base I built a head and a foot and joined them to the sides with things like
this (UK link, dunno what to search for in Dutch). As I wrote above, these allow you to knock the bed apart for removals etc. You can get flimsier ones stamped out of plate but I don't like them. You can also get others that use a long bolt and a cylindrical nut embedded in the bedpost but they've a bit fiddly and need precise drilling.
The head & foot I built have 7 cm square posts either end. Ours are 1m50 at the head and 1m tall at the foot, but that's just bombast. Handy to hang a wet jacket on, though.
I didn't put drawers underneath, but we have plastic boxes lids and wheels that roll away under it.