Girlfriend wakes me up in the middle of the night to talk?

She does it most nights; she gets anxious about something (be it work, family, her friends) and she always wants to chat at about 2 or 3 in the morning. I listen to her and help her out because i feel that's what a good boyfriend should do but it's also annoying because i want to get to sleep and my pattern is immediately broken. I want to talk to her at a more convenient time but i don't want to upset her when she's so anxious. What should I do?
Girlfriend wakes me up in the middle of the night to talk?
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