From the picture (target.scene7.com/is/image/Target/GUEST_92230237-6345-4736-95eb-3fed799e4d17?fmt=webp&wid=1400&qlt=80), there is no gap between the mattress and the headboard.

However, this item says it is Sold Out on target.com

It seems to be discontinued. Here is a similar item from Target: YouCopia SpiceStack Adjustable Spice Organizer White

This item is not bagless.

Try this bagless Kenmore canister vac: Kenmore 10701 Bagless Compact Canister Vacuum with Turbine Brush

Yes, this is a queen pillow, and is listed for both back and side sleepers.

Click on "Buy from Seller" to go to target.com. You can select the size there.

You would stand and bend. However, it is out of stock at target.com. I can't find anything else that looks like this item.

You might want to check out this: sears.com/weider-ultimate-body-works/p-00680975000P?sellerId=SEARS

All fitness: sears.com/search=all%20fitness?levels=Fitness%20%26%20Sports_Fitness%20%26%20Exercise&searsTab=true

This item is sold by Target. You should contact Target regarding their return policy.