Self-respect means your boundaries apply to your impulses too.

People usually think of boundaries as lines drawn around other people. But the impulse that arrives at eleven at night, the one that wants to send the message or spend the money or break the thing you have been building, is also asking for access to your life. If your limits only apply to outsiders, the most frequent visitor gets in unchecked.

Notice which of your own urges you would refuse if a friend proposed them on your behalf. Give one of those the same answer you would give them. Deciding in advance helps here, because in the moment the impulse is very good at arguing and you are usually tired.