Spying on your starter...
Just sharing a tip...
If you've got an old iPhone or tablet lying around, it really is dead easy to use it to take a time-lapse video of your starter's response to feeding or the inflation of your dough :)
I can't speak for other devices, but on the Apple ones you just bring up the camera, swipe left at the bottom to get to 'time-lapse', hit the record button and that's it. There's no need to adjust any settings, it just automatically reduces the frame rate depending on how long you leave it running (ten mins, a couple of hours, overnight or whatever). Obviously you probably need to leave it plugged in to the charger or the battery will go flat.
Personally I put an old wristwatch next to the container so I can see how much time's gone by at any point in the video.
An interesting thing to do is to get a few clear containers (e.g. shot glasses) and put them in a row. Put some discard in a bowl, feed it 1:1:1 and put a dollop in the first glass. Then 'feed' what's left in the bowl again (so you now have 1:2:2) and put a dollop in the next glass... etc. Set the camera up so it can see the whole row, go to bed - and then in the morning watch the video to see how long your starter takes to 'peak' for different feeding regimes. That's quite useful knowledge, if you want to adjust your timings.
Equally you could adjust the hydration level of the starter between the different glasses, or make a row of scraps of dough with different amounts of salt, percentages of wholewheat vs. plain ... ... ...
One final note though - friends and family seem (for some curious reason) to be not so interested in my home videos of overnight starter growth. No accounting for taste, eh?