I am going from Istanbul to Miami and have to stay in the Lisbon airport for 20 hours until my next flight departs to Miami.
I am a Colombian citizen with a US residency but since I was only going to be there for transit, I did not apply for a Uniform 'C' visa. Unfortunately, I wasn't expecting my layover to be so long.
Now, I can't leave the airport since I would require a Uniform 'C' Schengen visa if I was to leave, which I cannot get because it is too late now.
Thus, Are there any issues I can run into at the Lisbon airport considering that my stay will be about 20 hours long and will be overnight?