Soler not always followed by the infinitive?

[BlueSkies]

Well at first I learned the simple rule 'Soler + inf.' but today I came across the following:

'Los fines de semana solía quedarme en la cama hasta más tarde.'

The infinitive is quedarse, so why here is soler followed by quedarme?

Thanks in advance.

[Rusty]

The infinitive that has 'se' tacked onto its end is a pronominal infinitive. So, the conjugated soler is still in front of an infinitive; it's just a different type of infinitive. The conjugation is in the 1st-person, so the pronominal portion of the infinitive must agree with that person. Hence, the 'se' is changed to 'me', the 1st-person reflexive pronoun.

[BlueSkies]

Thank you!