Tell your parents not to worry about your social outings: you can get home safely with Tussam's intercity night bus service. The service is  available Friday, Saturday and on certain holidays, even into the wee hours of the night. Cost is 1,20 Euros on-board (Bonobuses may not apply!). Some lines are offered, but not all.

Lines: A1,A2,A3,A4,A5,A6, N28 and N29 run everyday of the week and from Prado San Sabastian (bus station) at 0:00, 1:00 and 2:00 a.m.

Line 16 offers night service Thursdays, Fridays, Saturdays and the day s before official holidays at 0:00, 1:00 y 2:00 from the Plaza Jerónimo de Córdoba. The cost of these two is the normal price and Bonobuses should apply.

Special Lines: Lines A1P,A2P,A3P,A4P,A5P,A6P,N28 y N29 operate at night on: Friday with departures at 3:00, 4:00 and 5:00 a.m. from Prado San Sebastián.
Saturday and the night before oficial holidays, there are departures at 3:00, 4:00, 5:00 and  6:00 from Prado San Sebastián. The price for a one-way tickert is 1,20 Euros and Bonobuses may not apply.
 
Consults about the night serice lines can be made here: http://www.tussam.es/index.php?id=238