عَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَانَ لَا يَنَامُ إِلَّا وَالسِّوَاكُ عِنْدَهُ، فَإِذَا اسْتَيْقَظَ بَدَأَ بِالسِّوَاكِ
It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that whenever the Messenger of Allah (peace and blessings be upon him) would sleep, the miswak would be near him. So when he would wake up, he would begin with the miswak.