if you can't think straight, you are not thinking calmly and clearly about something.

I was so tired I wasn't thinking straight any more.

There are so many people talking, I just can't think straight.

• stake a claim to something
• stake claim
• stake out
• stake out something
• stake someone out
• stake your claim
• stalking horse
• it is high time
• it just so happens
• it just so happens that
• It'll all come out in the wash.
• It'll all end in tears.
• It'll end in tears.
• It'll never fly.
• It never rains but it pours.
• it remains to be seen
• It's a bit steep!
• it's about time
• it's a crying shame
• It's a crying shame!
• It's a dog's life.
• It's a fair cop.
• It's a free country!
• it's all can do
• it's all can do to do something