How to sort lines by float number

I've such a file: name: xxx --- time: 5.4 seconds name: yyy --- time: 3.2 seconds name: zzz --- time: 6.4 seconds ... Now I want to sort this file by these float numbers to generate a new file as below: name: yyy --- time: 3.2 seconds name: xxx --- time: 5.4 seconds name: zzz --- time: 6.4 seconds ... I've tried the command awk '{print $5}' myfile | sort -g but this will show me ONLY the float numbers.