The Messenger of Allah said: "When anyone of you wakes up from sleep, he should not put his hand into the vessel until he has washed it." (Using translation from Ibn Mājah 394)   

قَالَ رَسُولُ اللَّهِ ﷺ «إِذَا اسْتَيْقَظَ أَحَدُكُمْ مِنْ نَوْمِهِ فَلَا يَغْمِسْ يَدَهُ فِي الْوَضُوءِ حَتَّى يَغْسِلَهَا ثَلَاثًا»