I did this little script to help me with the cycle I hope it will help some of you too !
For default, I have made 90 min cycle, but you can change it easily on the settings if you prefer an other time interval because it is really subjectif.
By default the cycle will begin at midnight from YOUR local time, but this can be a little annoying when you want for example to make it begin at midnght from NY or London without changing the UTC of your chart (if you still want to have your hour displayed normally).
I couldn't find an indicator to help me do that so I added a little setting which allow you to move the start hour of your cycle (so you will have to do some math to move it accordingly to what you want but that's okay ;) ).
That way you can choose the interval you like AND when it begin !