Ouch. I get that too, it is MS spasms in my case, and some neuropathy. I'm wondering if you're taking enough Baclofen at bed time, or if it isn't working well for you.
Do you stretch before you lie down? I do it right in bed before I plop. Sometimes a percussion massager helps the leg/foot spazzes calm down. I admit though, there are nights when I get up every 30 minutes to take more Zanaflex until it finally kicks in.
Hopefully, tonight will be a little better for you.