Rest/sleep concept/biological clock: Rest : 1) Player joins the game fully rested but slowly getting tired overtime (4-8 hours+). Injury and stress increase level of tiredness, body generated melatonin level change sleeping cycles, melatonin pills help to fall asleep. Sleep concept : 2)Player finds a place to hide and sleep/rest, secures his hideout perimeter somehow (barricades doors/IR boobytrap/etc). Player falling asleep if used melatonin pills, naturally because of high level of stress, tiredness or melatonin body level. Player can also fall a sleep in places not so safe but sleeping character can be easily robbed or killed. ~)After placing character to rest/sleep player safely leave and logsoff server - upon rejoin player must respawn at the same hideout location fully rested. If player rejoin server earlier then 4-5 hours character receive some rest penalty. 3) SHTF concept : More causes of natural death - hypothermia, malaria, diarrhea, food poisoning, animal attack. Thermal clothing, waterproofing and camp+fire should be a must for surviving a night in the rainy forest and great target for zombies at night. Should be implemented : Farming, Camping, Fishing, Hunting, Crafting, Dogs. 4)Miscellaneous : There should be more zombies in general, some should be in very very large groups that break away and randomly migrate towards places of interest (places that attract players). More rain and thunderstorms, daily rain should add more depressive atmosphere and encourage to look/build shelters/fires/survive.