Preemies are relatively immobile, so brushing against the rolled-up blanket is not likeley.
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As time goes on the team will introduce more positions into your babies routine and start to focus on getting into a good position through 'containment'. This means limiting their movement and giving them something to push against so they can practise flexing their muscles, similar to the position that they would naturally have in the womb at this stage of development. This is often done using rolled-up bedding, but make sure any fabric cannot get close to their face and impede their breathing. This can be done with your baby on his front or back.

Another option is to 'nest' your baby: building a nest of rolled-up blankets around so they are contained. They may need some cushioning under bony parts of their body such as their hips and knees.

https://www.tommys.org/pregnancy-information/pregnancy-compl...

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Note added at 1 hr (2017-12-23 19:10:48 GMT)
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Your premature baby has not had these benefits, so her reflexes may not yet be fully developed. muscle tone In the last two months in the womb a baby gets to push against resistance, which builds muscle
https://books.google.com/books?id=pl_Q68rQ7OcC&pg=PA86&lpg=P...
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Your baby will also feel more comfortable and secure if she is surrounded and supported in the incubator, so nurses will often make a "nest" to go around her so she has something to push against, like being in the uterus.

https://books.google.com/books?id=PmP2THTUiLEC&pg=PA50&lpg=P...

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A nest gives your baby boundaries to push against which will remind them of the boundaries they had when in the womb. Pushing against the nest's boundaries will mak
http://www.infantcentre.ie/our-research/research-studies/neo...