Editing Wrinkle (section)

=== Sleep wrinkles ===

Sleep wrinkles are created and reinforced when the face is compressed against a pillow or bed surface in side or stomach sleeping positions during sleep.<ref>{{cite journal|last=Sarifakioglu|first=Nedim|author2=Terzioglu, A. |author3=Ates, L. |author4=Aslan, G. |title=A New Phenomenon: 'Sleep Lines' on the Face|journal=Scan J Plast Reconstr Surg Hand Surg|year=2004|volume=38|pages=244–247|doi=10.1080/02844310410027257|pmid=15370809|issue=4|s2cid=25307487}}</ref> They appear in predictable locations due to the underlying [[superficial muscular aponeurotic system|superficial musculoaponeurotic system]] (SMAS), and are usually distinct from wrinkles of facial expression.<ref>{{cite journal|last=Fulton|first=James E.|author2=Gaminchi, F. |title=Sleep Lines|journal=Dermatol Surg|year=1999|volume=25|pages=59–62|doi=10.1046/j.1524-4725.1999.08073.x|pmid=9935097|issue=1}}</ref> As with wrinkles of facial expression, sleep wrinkles can deepen and become permanent over time, unless the habitual sleeping positions which cause the wrinkles are altered.<ref>{{cite journal|last=Sarifakioglu|first=Nedim|author2=Terzioglu, A. |author3=Ates, L. |author4=Aslan, G. |title=A New Phenomenon: 'Sleep Lines' on the Face|journal=Scan J Plast Reconstr Surg Hand Surg|year=2004|volume=38|pages=244–247 [246]|doi=10.1080/02844310410027257|pmid=15370809|issue=4|s2cid=25307487}}</ref>