It is not allowed for male children, if they are ten years old or more  or have reached the age of puberty, to sleep with their mothers or sisters in the same bedding or mattress. Children less than ten years old are permitted to do so if there is a need, such as looking after them, provided there is no fear of temptation.

Dusting off the bed is Sunnah and it should be done when one wants to sleep. It may be done with the edge of one’s garment or something else.

There is nothing wrong with a woman who is Junub cooking, looking after her house, taking care of her children or fulfilling any other needs.

There is nothing in Shari`ah to suggest that a Muslim has to sleep at a certain time and wake up at a certain time, and Islam does not tell the Muslim to sleep a certain number of hours. That depends on people’s ages and natures, and how much rest their bodies need, and it also depends on the nature of their work.

It is permissible for one who is Junub to go to sleep before doing Ghusl, then wake up to do Ghusl before praying Fajr. But it is better for him to do Wudu before going to sleep, and if he does Ghusl that is best.

Prophet Muhammad’s sleep routine: • He used to sleep sometimes on a mattress, sometimes on a leather mat, sometimes on a mat made of palm leaves, sometimes on the floor, sometimes on a bed, sometimes on the sand, and sometimes on a black cloak. • When he went to bed to sleep, he would say: “Allahumma bismika ahya wa amut.” • He used to sleep on his right side, putting his right hand under his right cheek. • When he woke up from sleep he would say: “Al-hamdu Lillah alladhi ahyana ba’d ma amatana wa ilayhi Al-nushur. • He used to sleep during the first part of the night and get up to pray during the last part. • His sleep was of the best length and it was the most beneficial of sleep. The doctors say that it is one-third of the night and day, namely eight hours.

There are so many sound du'as that you can say before sleeping that were narrated in the Prophet’s Sunnah. For more, see the detailed answer.

It is recommended to recite certain verses when he goes to bed such as: 1- Ayat Al-Kursiy, 2- the last two verses of Surat Al-Baqarah, 3- Surat Al-Isra’, 4- Surat Az-Zumar, 5- Surat Al-Kafirun, 6- the last three Surahs of the Quran.