Question:
If one woke up today before alos to eat, and could not remember whether he made a tnai the night before, is he allowed to eat? safek d’rabbanon lekula?
Answer:
If he had in mind to wake up early but he forgot to actually say it, b’dieved he may still eat, since the main part is that he had it in mind.
Sources:
Kovetz halachos ( R’ S. Kaminetzsky shlit”a) Bein Hamitzrim 2-11