Please edit this thread if some of these sunnahs are inauthentic.

Sunnah of Prophet Muhammad

Sunnahs of eating

  • Eating on the floor on a cloth
  • Wash both hands up to the wrists
  • Recite Bismillah before eating
  • Eat with the right hand
  • Eat from the side that is in front of you
  • If a morsel of food falls down, pick it up, clean it and eat it
  • Do not find fault or complain about the food
  • When eating, sit with either both knees on the ground or one knee raised or both knees raised
  • Clean the plate and other utensils thoroughly after eating.. There is a blessing in cleaning them. By doing this, the utensils make du'a for one's forgiveness.
  • Recite the du'a for after eating
  • After meals wash both the hands
  • Eat with three fingers if possible
  • One should not eat very hot food. Do not blow on the food.
  • Licking the fingers after eating
  • Don't be wasteful

Sunnahs of drinking

  • Drink with the right hand.. shaytaan drinks with the left hand.
  • Sit and drink
  • Recite Bismillah before drinking
  • After drinking say Alhamdullilah
  • Drink in 3 breaths removing the utensil from the mouth after each sip.. don't breath into the utensil while drinking
  • Do not drink directly from the jug or bottle. One should pour the contents into a glass first and then drink.

Sunnahs of sleeping

  • Sleep in the state of Wudu
  • Make the bed yourself
  • Dust the bed thrice before retiring to bed
  • Change your clothes (pajamas) before going to sleep
  • Sleep immediately after Isha Salaah
  • Apply surmah in both the eyes
  • Brush the teeth with a miswaak
  • Sleep on the right hand side
  • Sleep with the right palm under the right cheek
  • Keep the knees slightly bent when sleeping
  • Face Qiblah if possible
  • Recite Surah Mulk, before sleeping
  • Recite Ayatul Kursi
  • Recite Surah Ikhlaas, Surah Falaq and Surah Naas before sleeping 3 times and thereafter blow over the entire body thrice
  • Recite Tasbeeh-e-Fathima before sleeping.(33 Subhan Allah, 33 Alhamdulillah & 34 Allahu Akbar)
  • Recite the du'a before sleeping. Allahumma bismika amutu wa ahya
  • Wake up for Tahajjud Salaah

Sunnahs on awakening

  • Rub the face and the eyes with the palms of the hands in order to remove the effects of sleep
  • Clean out your nose
  • Recite the dua on awakening. Al hamdu lillahi allazi ahyana badama amatana wa ilaihunushur
  • Cleanse the mouth with a miswaak

Sunnahs when wearing clothes

  • RasoolAllah salAllahu alayhi wa salam loved white clothing
  • Put on your clothing beginning with the right limb and recite the du'a for wearing clothes
  • Say Bismillah before removing clothing and start with the left limb
  • Brothers wear your pants above the ankles. And sisters should ensure that their lower garment covers their ankles
  • When wearing shoes, first wear the right shoe then the left
  • When removing them first remove the left and then the right

Sunnahs of the toilet

  • Enter the toilet with your head covered
  • To enter the toilet with shoes
  • Recite the du'a before entering the toilet
  • Enter with the left foot
  • Sit and urinate. One should never urinate whilst standing.
  • Leave the toilet with the right foot
  • Recite the du'a after coming out of the toilet Ghufranaka
  • One should not face Qiblah or show his back towards the Qiblah
  • Do not speak in the toilet
  • Be very careful of the splashes of urine (being unmindful in this regard causes one to be punished in the grave)
  • After relieving oneself, to cleanse oneself using water

Sunnahs of the home

  • Recite the du'a before entering the home
  • Greet those that are in the house with Assalaamu Alaikum.
  • Announce your arrival by coughing, greeting, etc.

Other Sunnahs of high importance

  • Using a miswaak
  • Ghusl bath on a Jummuh
  • For men: apply itar
  • Show mercy to those that are younger than you
  • Respect your elders
  • For men to keep a beard that is one fist in length
  • Visit a Muslim when he is sick
  • Be good towards ones neighbour
  • Meet a Muslim with a cheerful face
  • Care for the poor and the needy
  • Keep good relations with all your relatives
  • Honour a guest and be hospitable towards them
  • Greet all Muslims with saalam
  • Keep the gaze on the ground whilst walking
  • Speak softly and politely
  • Command people to do good and forbid them from doing evil
  • Carry ones shoes in the left hand
  • Make wudu at home before going to the Masjid
  • Enter the Masjid with the right foot and recite the du'a for entering the Masjid
  • Leave the Masjid with the left foot and recite the du'a for leaving the Masjid
  • Recite Qur'an daily
  • Exchange gifts with one another
  • Make dua to Allah Ta'ala for the fulfillment of one's needs in what ever language one desires
  • Consult with one's parents, teachers or elders before doing any work
  • Respect one's parents

May Almighty Allah bless you all!