Great job on starting your paragraph! I can definitely help you with completing it and using the imperfect tense in French.
Here's a breakdown of the verbs you mentioned and how to conjugate them in the imperfect tense:
1. Couchais (ne couchais pas): This is the imperfect form of the verb "coucher" (to go to bed). You used it correctly.
2. Regardais: This is the imperfect form of the verb "regarder" (to watch). You used it correctly.
3. N'aimais pas: This is the imperfect form of the verb "aimer" (to like). It should be "Je n'aimais pas me lever tôt en vacances."
4. M'habillais: This is the imperfect form of the reflexive verb "s'habiller" (to get dressed). You used it correctly.
5. Se promenais: This is the imperfect form of the reflexive verb "se promener" (to walk). You used it correctly.
6. Me mangeait: This should be "je mangeais" because "manger" is not a reflexive verb. So it should be "Je mangeais une quiche avec ma mère."
7. Je buvais: This is the imperfect form of the verb "boire" (to drink). You used it correctly.
8. Tea noir: In French, "tea" is usually spelled as "thé." You can say "Je buvais du thé noir" to mean "I drank black tea."
So, here's the corrected version of your paragraph:
"L'hiver dernier, je ne me couchais pas tôt. Toutes les nuits, je restais éveillé(e) tard en regardant la télévision. Je n'aimais pas me lever tôt en vacances. À 10 heures, je m'habillais et me promenais dans le jardin. Ensuite, je mangeais une quiche avec ma mère. Je buvais un café tous les jours et du thé tous les soirs. Je buvais toujours du thé noir parce que c'est mon préféré."
Remember, the imperfect tense is used to describe habitual actions or to set the background for another action in the past. Keep practicing to become more comfortable with using this tense. You're doing great so far!