Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Can this unit be used on a "sleep number" mattress?
Document: At first, since I tend to sleep on one side or the other of the mattress, the plug connection was un-noticeable. But when sleeping in the middle of the bed I did finally feel the plug connection with my feet. But it is not a harsh feeling. It is a noticeable but smooth little bump. I agree with other reviewers that you would get used to it.3) Heating:  Heats up just fine.
The bed is nice and toasty when I am ready to go to bed and I don't have to remember to turn it on.3. Auto-off choice of hoursThe controller has a choice for the number of hours you want the unit to stay on before turning off. The choices are 2 hours, 6 hours or 10 hours. The unit comes pre-set at 10 hours. For myself the 2 hours is perfect.I am extremely pleased with this purchase.
Our old warmer was of a &#34;sensing&#34; type that only heated up when pressure was applied. That didn't get the bed very warm until you actually got in it. This heated mattress pad warms up very, very nicely so you're warm when you get in, not a few minutes later. The only problem is, it's easy to hit the wrong buttons (when the control unit is on the floor), but that's so minor it still gets five stars.
I purchased this mattress pad specifically for the features that two other reviewers mentioned, the ability to have the unit turn on automatically at the same time each day. Unfortunately, this product does not have that capability. The accompanying manual shows the different control models that may be included with your particular unit, and one of them evidently does have a clock which would allow you to set the unit to come on automatically. I don't want others to make the same mistake . . . . .
This heated mattress pad is great. We can keep the thermostat down and still get a great night's sleep. Everyone should have one of these! !
The Sunbeam places the plug at the foot of the bed, where a tall person's foot is certain to feel it at some point. (My prior heated mattress pad, no longer made, had its remotes plug into the mattress pad on the side edges of the bed, where you never actually sleep so you'd never feel them once in bed.)
Never have written a review, but love, love, love the heated mattress pad. First time I've used one, got tired of crunchy heating pads or microwavable heating pads that give out after an hour. This is lovely and warm all night long, no more cold feet. And the cats love it too, and they can be found nestled on it during the day, if I forget to turn it off.
I would recommend this product. This is the second Sunbeam heated mattress pad I've bought and I love that this one is machine washable. The old one lasted about ten years so I expect this one to last a long time too. I have poor circulation in my legs and my feet never seem to feel warm enough. A few minutes after I turn the pad on my bed is toasty warm and I'm able to go right to sleep.
I struggled with purchasing a heated mattress pad (Queen size) for multiple reasons.1) Will I feel the wires?2) Will I feel the plug connection at the bottom of mattress?3) Will it actually heat up and not stay hot when I turn it off.I have used this model (DesignSmart controller) for about a week.1) Wires. The description says the wires are "virtually impossible" to feel. I guess if you pressed really, really hard you could feel them.
As others have stated this unit can get very hot - i usually have mine set at 3 or lower. Well worth the money. You won't regret this.
Answer: Yes.  We have a sleep number bed and this matress pad works fine.