The following is an Amal to protect one from mosquitoes at night when one is asleep:
Take a jug of water, read the following verse 7 times and blow in it.
(ابراهيم: 12) وَمَا لَنَا أَلَّا نَتَوَكَّلَ عَلَى اللَّهِ وَقَدْ هَدَانَا سُبُلَنَا ۚ وَلَنَصْبِرَنَّ عَلَىٰ مَا آذَيْتُمُونَا ۚ وَعَلَى اللَّهِ فَلْيَتَوَكَّلِ الْمُتَوَكِّلُونَ
Then sprinkle this water around the bed. Say the following whilst sprinkling the water: