Tara was losing her mind.The 37-year-old, who lives in Tulsa, Oklahoma, had four sons under the age of 8. She was looking after them all single-handedly, while freelancing part-time as an artist. The youngest, Davey, was just 16 weeks old: He’d been born just after Tara’s husband, a Marine, had been deployed to the Western Pacific. He wouldn’t be back for five months; their baby was waking up every two hours in the night. The situation felt unsu…