Pls help me! alerts, message, notifications help

hi traders,
The trades I am holding are often open for days. This brings the problem of missing certain points when im asleep. I want my phone to receive an alert or notification to wake me up when the market reaches a certain value. I contacted my broker and they said the only solution was to buy their partnered VPS (Which is approx. $50/month). All I want is this notification to wake me up or to grab my attention when im not at the computer. Surely there is apps out there that monitors this or some cheaper alternative.
Please take it easy this is my first post ever haha,
Thanks!

Dillon