# Sleep cycles and power consumption

**URL:** <https://community.particle.io/t/sleep-cycles-and-power-consumption/48334>\
**Category:** Hardware\
**Tags:** electron\
**Created:** [March 10, 2019, 4:50am UTC](https://community.particle.io/t/sleep-cycles-and-power-consumption/48334 "2019-03-10T04:50:08Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![DRCO](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/drco/32/5268_2.png) [@DRCO](https://community.particle.io/u/DRCO)\
**Post date:** [March 13, 2019, 9:40pm UTC](https://community.particle.io/t/sleep-cycles-and-power-consumption/48334/13 "2019-03-13T21:40:39Z")

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Thanks for jumping in on this subject – not the first time you’ve set me straight on Particle stuff and I greatly appreciate it. My reference to the 23 minute sleep cycle limit came from[a post you did back in 2016](https://community.particle.io/t/keepalives-between-sleep-stop-mode-periods/25276) – and on re-read clearly does not apply to the System.sleep(SLEEP\_MODE\_DEEP, XXXX); - but does apply to System.sleep(SLEEP\_MODE\_DEEP, XXXX, SLEEP\_NETWORK\_STANDBY);  
Have I got that right?  
I think the reason for my confusion was that I spent so much time trying to get the standby mode working (as it has a rapid transition to network and cloud connection) that I thought the 23 minute limit applied to all sleep modes.  
My mistake.  
So to be clear, if I use the deep sleep mode, I can sleep as long as I like? This will greatly simplify my code and improve power consumption, hopefully to the point where a 6 volt battery, with 3 watt solar panel could easily power my project even through extended periods of no sunlight.  
I’m thinking I could use the (Time.hour()); function to sleep for extended periods after sunset until dawn (say 12 hours) – then take samples from sensors every 90 minutes throughout the day.  
No need for sleep cycle functions, retained variables, turning on or off the cell module or SYSTEM\_MODE(SEMI\_AUTOMATIC);  
Happy days – I’ll try it.

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